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AudioChannelMix
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AudioChannelMix

Updated in 14.1

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mixes channels of audio by averaging and returns a center-panned stereo audio object.

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AudioChannelMix[audio,desttype]

mixes audio channels into the specified desttype.

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AudioChannelMix[video,…]

mixes audio channels of video.

Details

  • The following destination type desttype can be specified for an m channel audio object:
  • "Mono"mono signal, using the average channel value
    {"Mono",{w1,…,wm}}mono signal, using a weighted average
    "Stereo"stereo signal, using the average value and center panning
    {"Stereo",{w1,…,wm}}stereo signal, using weighted average and center panning
    {"Stereo",{w1,…,wm},{p1,…,pm}}stereo signal, using weighted average and specified panning
    nn-channel signal, evenly distributing the m input channels
    {n,mat}n-channel signal, using an arbitrary m×n distribution matrix mat
  • In the distribution matrix mat, the element wij is the amount of input channel i that goes into the output channel j.
  • The given weights wi can be given as scalar multipliers or in decibels.
  • A scalar multiplier wi is equivalent to in decibels.
  • For "Stereo" mixing, sinusoidal panning is used.
  • The AudioType of the returned object is either "Real32" or "Real".

Examples

open allclose all

Basic Examples  (1)Summary of the most common use cases

Convert mono audio to stereo:

In[1]:=1
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https://wolfram.com/xid/0bc6k05vux36hgw-d6moe5
In[2]:=2
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https://wolfram.com/xid/0bc6k05vux36hgw-nmoeax
Out[2]=2

Downmix stereo audio to mono:

In[3]:=3
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https://wolfram.com/xid/0bc6k05vux36hgw-2h86as
Out[3]=3

Scope  (5)Survey of the scope of standard use cases

When downmixing to mono, the average of all input channels is used by default:

In[1]:=1
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https://wolfram.com/xid/0bc6k05vux36hgw-4a2cli
In[2]:=2
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https://wolfram.com/xid/0bc6k05vux36hgw-dpvymx
Out[2]=2

Specify the weights assigned to the input channels:

In[3]:=3
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https://wolfram.com/xid/0bc6k05vux36hgw-slyxue
Out[3]=3

When mixing to stereo, the average of all input channels is replicated on both output channels by default:

In[1]:=1
✖
https://wolfram.com/xid/0bc6k05vux36hgw-84wdvl
Out[1]=1

Use different weights for each input channel:

In[2]:=2
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https://wolfram.com/xid/0bc6k05vux36hgw-hm3vwk
Out[2]=2

By default, all input channels are center panned. Specify the amount of panning for each input channel:

In[3]:=3
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https://wolfram.com/xid/0bc6k05vux36hgw-rpapqf
Out[3]=3

Create a three-channel signal by evenly mixing all input channels:

In[1]:=1
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https://wolfram.com/xid/0bc6k05vux36hgw-0hgv6g
In[2]:=2
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https://wolfram.com/xid/0bc6k05vux36hgw-c9d0nv
Out[2]=2

Specify all weights using a distribution matrix:

In[3]:=3
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https://wolfram.com/xid/0bc6k05vux36hgw-hhaawy
Out[3]=3

Specify weights in decibels:

In[1]:=1
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https://wolfram.com/xid/0bc6k05vux36hgw-uiohph
Out[1]=1

Process the audio track of a video:

In[1]:=1
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https://wolfram.com/xid/0bc6k05vux36hgw-l7x9gq
Out[1]=1

Applications  (2)Sample problems that can be solved with this function

Conform the number of channels of a list of audio objects without using padding:

In[1]:=1
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https://wolfram.com/xid/0bc6k05vux36hgw-tmyo4a
In[3]:=3
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https://wolfram.com/xid/0bc6k05vux36hgw-zyc4z1
Out[3]=3
In[4]:=4
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https://wolfram.com/xid/0bc6k05vux36hgw-6v5xa6
Out[4]=4
In[4]:=4
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https://wolfram.com/xid/0bc6k05vux36hgw-5yqt0
Out[4]=4

Distribute a mono Audio object to an arbitrary number of output channels:

In[1]:=1
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https://wolfram.com/xid/0bc6k05vux36hgw-bqegyj
In[2]:=2
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https://wolfram.com/xid/0bc6k05vux36hgw-850toc
Out[2]=2

Properties & Relations  (4)Properties of the function, and connections to other functions

Downmix a signal to a single channel using audio arithmetics:

In[31]:=31
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https://wolfram.com/xid/0bc6k05vux36hgw-enrtiz
In[32]:=32
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https://wolfram.com/xid/0bc6k05vux36hgw-m7utm9
Out[32]=32

If no weights are specified, the average of the input channels is replicated on all output channels:

In[1]:=1
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https://wolfram.com/xid/0bc6k05vux36hgw-zrlfdx
In[2]:=2
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https://wolfram.com/xid/0bc6k05vux36hgw-c0ivvq
Out[2]=2

Relation with Dot:

In[1]:=1
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https://wolfram.com/xid/0bc6k05vux36hgw-3592ku
In[2]:=2
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https://wolfram.com/xid/0bc6k05vux36hgw-3l6tx1
Out[2]=2

If the destination is "Stereo", the panning specification is equivalent to an AudioPan operation:

In[1]:=1
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https://wolfram.com/xid/0bc6k05vux36hgw-828ukx
In[2]:=2
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https://wolfram.com/xid/0bc6k05vux36hgw-xzlk8q
Out[2]=2
Wolfram Research (2016), AudioChannelMix, Wolfram Language function, https://reference.wolfram.com/language/ref/AudioChannelMix.html (updated 2024).
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Wolfram Research (2016), AudioChannelMix, Wolfram Language function, https://reference.wolfram.com/language/ref/AudioChannelMix.html (updated 2024).

Text

Wolfram Research (2016), AudioChannelMix, Wolfram Language function, https://reference.wolfram.com/language/ref/AudioChannelMix.html (updated 2024).

✖
Wolfram Research (2016), AudioChannelMix, Wolfram Language function, https://reference.wolfram.com/language/ref/AudioChannelMix.html (updated 2024).

CMS

Wolfram Language. 2016. "AudioChannelMix." Wolfram Language & System Documentation Center. Wolfram Research. Last Modified 2024. https://reference.wolfram.com/language/ref/AudioChannelMix.html.

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Wolfram Language. 2016. "AudioChannelMix." Wolfram Language & System Documentation Center. Wolfram Research. Last Modified 2024. https://reference.wolfram.com/language/ref/AudioChannelMix.html.

APA

Wolfram Language. (2016). AudioChannelMix. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/AudioChannelMix.html

✖
Wolfram Language. (2016). AudioChannelMix. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/AudioChannelMix.html

BibTeX

@misc{reference.wolfram_2025_audiochannelmix, author="Wolfram Research", title="{AudioChannelMix}", year="2024", howpublished="\url{https://reference.wolfram.com/language/ref/AudioChannelMix.html}", note=[Accessed: 09-July-2025 ]}

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@misc{reference.wolfram_2025_audiochannelmix, author="Wolfram Research", title="{AudioChannelMix}", year="2024", howpublished="\url{https://reference.wolfram.com/language/ref/AudioChannelMix.html}", note=[Accessed: 09-July-2025 ]}

BibLaTeX

@online{reference.wolfram_2025_audiochannelmix, organization={Wolfram Research}, title={AudioChannelMix}, year={2024}, url={https://reference.wolfram.com/language/ref/AudioChannelMix.html}, note=[Accessed: 09-July-2025 ]}

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@online{reference.wolfram_2025_audiochannelmix, organization={Wolfram Research}, title={AudioChannelMix}, year={2024}, url={https://reference.wolfram.com/language/ref/AudioChannelMix.html}, note=[Accessed: 09-July-2025 ]}